LAS VEGAS, NV - DECEMBER 15: Republican presidential candidate U.S. Sen. Rand Paul (R-KY) (R) speaks as New Jersey Gov. Chris Christie listens during the CNN Republican presidential debate on December 15, 2015 in Las Vegas, Nevada. This is the last GOP debate of the year, with U.S. Sen. Ted Cruz (R-TX) gaining in the polls in Iowa and other early voting states and Donald Trump rising in national polls. (Photo by Justin Sullivan/Getty Images)

LAS VEGAS, NV - DECEMBER 15: Republican presidential candidate Donald Trump is introduced during the CNN presidential debate at The Venetian Las Vegas on December 15, 2015 in Las Vegas, Nevada. Thirteen Republican presidential candidates are participating in the fifth set of Republican presidential debates. (Photo by Ethan Miller/Getty Images)

LAS VEGAS, NV - DECEMBER 15: Republican presidential candidates (L-R) Ben Carson, Donald Trump and Sen. Ted Cruz (R-TX) stand on stage as they are introduced during the CNN presidential debate at The Venetian Las Vegas on December 15, 2015 in Las Vegas, Nevada. Thirteen Republican presidential candidates are participating in the fifth set of Republican presidential debates. (Photo by Ethan Miller/Getty Images)

LAS VEGAS, NV - DECEMBER 15: Republican presidential candidate U.S. Sen. Ted Cruz (R-TX) speaks during the CNN Republican presidential debate on December 15, 2015 in Las Vegas, Nevada. This is the last GOP debate of the year, with U.S. Sen. Ted Cruz (R-TX) gaining in the polls in Iowa and other early voting states and Donald Trump rising in national polls. (Photo by Justin Sullivan/Getty Images)

LAS VEGAS, NV - DECEMBER 15: Republican presidential candidate U.S. Sen. Rand Paul (R-KY) speaks during the CNN Republican presidential debate on December 15, 2015 in Las Vegas, Nevada. This is the last GOP debate of the year, with U.S. Sen. Ted Cruz (R-TX) gaining in the polls in Iowa and other early voting states and Donald Trump rising in national polls. (Photo by Justin Sullivan/Getty Images)

LAS VEGAS, NV - DECEMBER 15: Republican presidential candidate U.S. Sen. Marco Rubio (R-FL) waves as he walks onstage during the CNN Republican presidential debate on December 15, 2015 in Las Vegas, Nevada. This is the last GOP debate of the year, with U.S. Sen. Ted Cruz (R-TX) gaining in the polls in Iowa and other early voting states and Donald Trump rising in national polls. (Photo by Justin Sullivan/Getty Images)

LAS VEGAS, NV - DECEMBER 15: Republican presidential candidates Donald Trump (L) and Sen. Ted Cruz (R-TX) stand on stage as they are introduced during the CNN presidential debate at The Venetian Las Vegas on December 15, 2015 in Las Vegas, Nevada. Thirteen Republican presidential candidates are participating in the fifth set of Republican presidential debates. (Photo by Ethan Miller/Getty Images)

2016 Republican presidential candidates Senator Marco Rubio, a Republican from Florida, from left, Ben Carson, retired neurosurgeon, Donald Trump, president and chief executive of Trump Organization Inc., Senator Ted Cruz, a Republican from Texas, and Jeb Bush, former governor of Florida, listen to the U.S. National Anthem during the Republican presidential candidate debate at The Venetian in Las Vegas, Nevada, U.S., on Tuesday, Dec. 15, 2015. With less than two months remaining before the Feb. 1 Iowa caucuses and the Feb. 9 New Hampshire primary, middle-of-the-pack candidates hoping for a late surge in the polls have little choice but to come out swinging in tonight's fifth Republican debate. Photographer: Ruth Fremson/Pool via Bloomberg

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"As far as the internet is concerned: I'm not talking about closing the internet," Trump responded.

"I'm talking about parts of Syria, parts of Iraq, where ISIS is. Spotting it. Now, you could close it," he continued. "What I like even better than that is getting our smartest and getting our best to infiltrate their internet. So that we know exactly where they're going, exactly where they're going to be. I like that better!"

The audience then erupted into cheers and applause with some loud booing mixed in. Trump was puzzled.

He then lectured his hecklers.

"I just can't imagine somebody booing," Trump reflected. "These are people that want to kill us, folks. And you're objecting to us infiltrating their conversations? I don't think so. I don't think so."